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<title>NDS32 Function Attributes (Using the GNU Compiler Collection (GCC))</title>

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<h4 class="subsection" id="NDS32-Function-Attributes-1"><span>6.33.21 NDS32 Function Attributes<a class="copiable-link" href="#NDS32-Function-Attributes-1"> &para;</a></span></h4>

<p>These function attributes are supported by the NDS32 back end:
</p>
<dl class="table">
<dt><a class="index-entry-id" id="index-exception-handler-functions_002c-NDS32"></a>
<a id="index-exception-function-attribute"></a><span><code class="code">exception</code><a class="copiable-link" href="#index-exception-function-attribute"> &para;</a></span></dt>
<dd><p>Use this attribute on the NDS32 target to indicate that the specified function
is an exception handler.  The compiler will generate corresponding sections
for use in an exception handler.
</p>
</dd>
<dt><a id="index-interrupt-function-attribute_002c-NDS32"></a><span><code class="code">interrupt</code><a class="copiable-link" href="#index-interrupt-function-attribute_002c-NDS32"> &para;</a></span></dt>
<dd><p>On NDS32 target, this attribute indicates that the specified function
is an interrupt handler.  The compiler generates corresponding sections
for use in an interrupt handler.  You can use the following attributes
to modify the behavior:
</p><dl class="table">
<dt><a id="index-nested-function-attribute_002c-NDS32"></a><span><code class="code">nested</code><a class="copiable-link" href="#index-nested-function-attribute_002c-NDS32"> &para;</a></span></dt>
<dd><p>This interrupt service routine is interruptible.
<a class="index-entry-id" id="index-not_005fnested-function-attribute_002c-NDS32"></a>
</p></dd>
<dt><code class="code">not_nested</code></dt>
<dd><p>This interrupt service routine is not interruptible.
<a class="index-entry-id" id="index-nested_005fready-function-attribute_002c-NDS32"></a>
</p></dd>
<dt><code class="code">nested_ready</code></dt>
<dd><p>This interrupt service routine is interruptible after <code class="code">PSW.GIE</code>
(global interrupt enable) is set.  This allows interrupt service routine to
finish some short critical code before enabling interrupts.
<a class="index-entry-id" id="index-save_005fall-function-attribute_002c-NDS32"></a>
</p></dd>
<dt><code class="code">save_all</code></dt>
<dd><p>The system will help save all registers into stack before entering
interrupt handler.
<a class="index-entry-id" id="index-partial_005fsave-function-attribute_002c-NDS32"></a>
</p></dd>
<dt><code class="code">partial_save</code></dt>
<dd><p>The system will help save caller registers into stack before entering
interrupt handler.
</p></dd>
</dl>

</dd>
<dt><a id="index-naked-function-attribute_002c-NDS32"></a><span><code class="code">naked</code><a class="copiable-link" href="#index-naked-function-attribute_002c-NDS32"> &para;</a></span></dt>
<dd><p>This attribute allows the compiler to construct the
requisite function declaration, while allowing the body of the
function to be assembly code. The specified function will not have
prologue/epilogue sequences generated by the compiler. Only basic
<code class="code">asm</code> statements can safely be included in naked functions
(see <a class="pxref" href="Basic-Asm.html">Basic Asm &mdash; Assembler Instructions Without Operands</a>). While using extended <code class="code">asm</code> or a mixture of
basic <code class="code">asm</code> and C code may appear to work, they cannot be
depended upon to work reliably and are not supported.
</p>
</dd>
<dt><a class="index-entry-id" id="index-reset-handler-functions"></a>
<a id="index-reset-function-attribute_002c-NDS32"></a><span><code class="code">reset</code><a class="copiable-link" href="#index-reset-function-attribute_002c-NDS32"> &para;</a></span></dt>
<dd><p>Use this attribute on the NDS32 target to indicate that the specified function
is a reset handler.  The compiler will generate corresponding sections
for use in a reset handler.  You can use the following attributes
to provide extra exception handling:
</p><dl class="table">
<dt><a id="index-nmi-function-attribute_002c-NDS32"></a><span><code class="code">nmi</code><a class="copiable-link" href="#index-nmi-function-attribute_002c-NDS32"> &para;</a></span></dt>
<dd><p>Provide a user-defined function to handle NMI exception.
<a class="index-entry-id" id="index-warm-function-attribute_002c-NDS32"></a>
</p></dd>
<dt><code class="code">warm</code></dt>
<dd><p>Provide a user-defined function to handle warm reset exception.
</p></dd>
</dl>
</dd>
</dl>

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